HMC985

www.DataSheet.co.kr HMC985 v00.0211 Gaas mmic voltage - variable attenuator, 20 - 50 GHz 0 attenuators - analog - Chip Typical Applications The HMC985 is ideal for: Point-to-Point Radio VSAT Radio Test Instrumentation Microwave Sensors Military, ECM & Radar Features Wide Bandwidth: 20 - 50 GHz Excellent Linearity: +32 dB Input IP3 Wide Attenuation Range: 35 dB Die Size: 2.78 x 1.37 x 0.1 mm General Description The HMC985 is an absorptive Voltage Variable Attenuator (VVA) which operates from 20 - 50 GHz and is ideal in designs where an analog DC control signal must be used to control RF signal levels over a 35 dB dynamic range. It features two shunt-type attenuators which are controlled by two analog voltages, Vctrl1 and Vctrl2. Optimum linearity performance of the attenuator is achieved by first varying Vctrl1 of the first attenuation stage from -3V to 0V with Vctrl2 fixed at -3V. The control voltage of the second attenuation stage, Vctrl2, should then be varied from -3V to 0V with Vctrl1 fixed at 0V. However, if the Vctrl1 and Vctrl2 pins are connected together it is possible to achieve the full analog attenuation range with only a small degradation in input IP3 performance. Applications include AGC circuits and temperature compensation of multiple gain stages in microwave point to point and VSAT radios. Functional Diagram Electrical Specifications, TA = +25 °C, See Test Conditions Parameter Condition 20 - 27 Insertion Loss 27 - 35 35 - 50 20 - 27 Atte...